Upon reboot and login, I needed to "startx"At that point, everything appears to be working properly.Right-click on the screen to log out succeeds in logging out of Xwindow system, but not the user.As far as I can tell, the KDM login manager is missing.??

going to settings/system settings/login screen (SDDM)there the only settable option that I find is color. And I don't see a noticeable change when I do change the color.Apparently SDDM does NOT log out the user. All that it succeeds in doing is shutting down Xwindows. At that point, it is necessary to logout/login, startx.